Carrie's 10-Step Soap Mold Lining Instructions 

Step One: Cut a piece of freezer paper (one side is coated with plastic) to fit the mold with plenty of excess on all sides. Place the paper plastic (shiny) side UP on top of your mold. Fold the short ends over so that the length of the paper is the same as the inside of the mold. In the pictures I am using a 6# mold, which is 3.5" wide, 3" high, and 20" long.

Step Two: Press the paper down into the mold, it will look a bit like a taco. Remember that the shiny side of the paper should be up.

Step Three: With your thumbnail, crease along the bottom corners of the mold. Make sure these creases fit flush into the corners.

Step Four: Remove the paper from the mold and re-crease the folds sharply. This is important so that your soap bars have nice corners.

Step Five: Cut a half-circle from each corner of the paper flaps. This removes bulk and helps the paper fit in the mold better. You don't have to be particularly neat, but leave at least 1" of paper by the creases.

Step 6: Lift a short end and a long end. At the corner, create a triangular flap of paper; make sure this folds behind the short end of the paper. Crease the flap well, ensuring that the corner folds nest together (see right beneath my thumb).

Step Seven: Repeat at the other corner. The triangular flaps may overlap slightly, this is fine. The end will now look like the side of a Chinese take-out container. Repeat for the corners at the other end of the paper. You do not need to tape these flaps down; they will stay in place during the next couple steps.

Step Eight: Place the paper back into the mold. Make sure it fits snugly and that all corners and creases are tight. The picture below shows how the end flaps will look at this point.

Step Nine: Press the paper against the top edge of your mold to crease it. At the corners, cut the paper in such a way that it will fold over your mold (make vertical cuts just to the top of the mold). Again, the shiny or coated side of the paper needs to be up.

Step Ten: Tape the excess paper to the mold, making sure the top edge is creased along the mold well. You shouldn't need a lot of tape (masking tapes works well); I use four to six short pieces per mold. Pour your soap!  After the soap has set (roughly 24 hours), use the excess paper flaps to lift the soap log out of the mold.  Voila!